Application of Secondary Neutral Mass Spectrometry in the investigation of doped perovskites

TL;DR

This paper demonstrates the use of Secondary Neutral Mass Spectrometry (SNMS) to accurately determine the composition and oxygen content of doped perovskites, correlating these measurements with their electromagnetic properties.

Contribution

It introduces SNMS as an effective technique for quantitative analysis of doped perovskites, applicable to both insulating and conducting samples, enhancing sample characterization accuracy.

Findings

SNMS accurately measures composition and oxygen content.

Electromagnetic properties correlate with measured compositions.

Method applicable to various types of perovskite compounds.

Abstract

Electromagnetic properties of doped perovskites depend sensitively on the doping level. Both the superconducting transition temperature of Bi2Sr2Ca(Pr)Cu2O8+d compounds and the magnetic and electronic transport properties of La(Sr)Co(Fe)O3 perovskites change dramatically with the doping level. Apart from doping, oxygen deficiency is influenced by the details of preparation processes such as calcination and sintering. Simultaneous determination of constituents is of crucial importance from sample characterization point of view. Quantitative analysis of perovskite oxides can be performed by Secondary Neutral Mass Spectrometry (SNMS) which is a suitable technique to measure the chemical composition of almost any sample because the flux of atoms sputtered from the sample is representative of the stoichiometry of the top-most layers. The composition and oxygen content of Bi2Sr2Ca0.86Pr0.14Cu2O8.4 and La1-xSrxCo0.975Fe0.025O3-d, where 0<x<0.5, were determined by SNMS. The results show that the method is equally applicable for insulating and conducting compounds. The observed electromagnetic properties reflect well the compositions obtained experimentally.